This sentenced jumped out at me.
"This new data also estimated that emissions for the entire 19-counties of
the Barnett Shale area were approximately 200 tons per day."
from the desk of Al Armendariz, Ph.D.
STATE DATA SUPPORTS CONCLUSIONS OF EDF/SMU STUDY ON BARNETT SHALE EMISSIONS
Oil and gas sector emissions in the Dallas-Fort Worth area are significant, but cost-effective solutions are available to reduce the environmental impact and increase revenue for oil and gas producers.
These updated state results are extremely consistent with the independently-produced results of the SMU/EDF study that I released in January 2009. For the 2007 calendar year, I estimated emissions in the 9-county metropolitan area to be 112 tpd on average and I estimated estimates for the entire 19-county Barnett Shale area to be 191 tpd on average. These numbers are within 10-20% of the TCEQ estimates (90 vs 100, 200 vs 191).
Environmental Defense Fund